This is probably the easiest challenge since I similar to Positronics already play with all the requirement aside from no rape the bandits (more of I want to be chaotic good than lawful good, not because I need the mana). Maybe a better name would be 'Lawful Good Paladin' challenge, if you decide to add a requirement of only allow a player to complete 'lawful good' custom request like helping market stall, city guards... etc.
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Personally I'd like to think I'm playing as a 'servant' owner rather than a slave owner if I don't brand anyone. Since even the game itself calls your starter 'starting servant' instead of 'starting slave'. I'm rehabilitating the bandits in the wild who prowl on the weak and turning them into productive citizens by preparing them to work for market stalls or city guards.
XD